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Calibration curve
About: Calibration curve is a research topic. Over the lifetime, 6552 publications have been published within this topic receiving 95128 citations.
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TL;DR: In this paper, a relative efficiency calibration curve for a 2.2 m McPherson grazing incidence monochromator has been established using cascade relations in Be-like heavy ions.
Abstract: Previously a relative efficiency calibration curve for a 2.2 m McPherson grazing incidence monochromator has been established using cascade relations in Be-like heavy ions. The curve has now been confirmed and extended to cover the wavelength range 10 nm ≤ λ ≤ 80 nm using branching ratios for Δn ≠ 0 transition in Li-like ions. A summary of various measurements applicable to problems of astrophysical and plasma physics interest is given.
36 citations
TL;DR: Several gases of practical importance are concluded to be determined as to concentration to a few parts per billion with a precision of 10% or less, if path lengths of the order of several hundred meters are used.
Abstract: The method of spectrometric determination of gas concentration by use of a mask is examined and described. Calibration curves for four gases, NH(3), C(6)H(5)CH(3), NO(2), and SO(2), are reported in detail, and results are included for C(6)H(6), NO, and SiF(4). The calibration curves are shown to be linear in a log-log plot over ranges of practical interest. The slopes are reproducible. The technique used in making masks is described. The proposed manner of making measurements involves the use of a small reference cell containing a sample of the gas being measured. When such a method of measurement is used, several gases of practical importance are concluded to be determined as to concentration to a few parts per billion with a precision of 10% or less, if path lengths of the order of several hundred meters are used. The results appear to be independent of the presence of unknown absorbing gases under many circumstances.
36 citations
TL;DR: In the field demonstrations reported in this communication, remarkably good agreement between the in-situ FO-LIBS results and ICP lab results were obtained.
Abstract: A direct push, FO-LIBS sensor probe for real-time, in-situ measurement of metals in soils has been built and its capabilities demonstrated at three sites. The response of the FO-LIBS sensor is affected by the soil matrix conditions of grain size, composition, and water content. For each site, uncontaminated soil was collected and spiked with known quantities of the metal under investigation. These calibration standards were used to generate a site-specific calibration curve, which compensates for variations in soil matrix conditions of grain size, composition, porosity, etc. To compensate for moisture content, extra laser pulses are used to volatilize the water, higher power densities and/or shortened acquisition delay times are used. The LIBS experiment inherently exhibits poor precision since it is a point measurement. When multiple spectra are taken of a single, homogenized soil sample, there is a significant amount of variability in the peak intensities. There is no internal standard available to corr...
36 citations
Patent•
14 Nov 2001TL;DR: In this article, a sheet of calibration media is used in a way that prevents the calibration media errors from affecting the calculation, so that the calculated calibration values precisely correct the characteristic sinusoidal feed errors of that printer.
Abstract: A simple, yet accurate way of determining calibration values for correcting the characteristic sinusoidal feed errors of a printer or other recording device (such as a fax machine, plotter, etc.). A sheet of calibration media is employed for facilitating the calculation of the calibration values. The sheet is used in a way that prevents the calibration media errors from affecting the calculation. In particular, the sheet of calibration media is fed twice through the printer, and position data is collected each time. The data is processed in a way that cancels the attendant calibration media errors so that the calculated calibration values precisely correct the characteristic sinusoidal feed errors of that printer.
36 citations
TL;DR: In this article, the calibration coefficients of several models of cup and propeller anemometers were analyzed based on a series of laboratory calibrations between January 2003 and August 2007, and the results revealed that the slope of the calibration curve, if based on the rotation frequency and not the anemometer's output frequency, seemed to depend on the cup center rotation radius.
Abstract: The calibration coefficients of several models of cup and propeller anemometers were analysed. The analysis was based on a series of laboratory calibrations between January 2003 and August 2007. Mean and standard deviation values of calibration coefficients from the anemometers studied were included. Two calibration procedures were used and compared. In the first, recommended by the Measuring Network of Wind Energy Institutes (MEASNET), 13 measurement points were taken over a wind speed range of 4 to 16 m s−1. In the second procedure, 9 measurement points were taken over a wider speed range of 4 to 23 m s−1. Results indicated no significant differences between the two calibration procedures applied to the same anemometer in terms of measured wind speed and wind turbines' Annual Energy Production (AEP). The influence of the cup anemometers' design on the calibration coefficients was also analysed. The results revealed that the slope of the calibration curve, if based on the rotation frequency and not the anemometer's output frequency, seemed to depend on the cup center rotation radius. Copyright © 2010 John Wiley & Sons, Ltd.
36 citations